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There are no scripts for the AI heroes. It simply understands how to use Dispel and Anti-Magic, which makes Light very dangerous on them. Especially if the AI doesn't have Resurrection, it disrupts a lot with its high priority. I won't even mention the Dodge skill. It absolutely shouldn't be given to the AI due to a bug.
At least somewhere, the Necropolis faction is suffering.
This is the formula for calculating the "meat" (stats) of AI heroes. The idea is to multiply some base number by the current week and then by the difficulty level. I call it that because it's very often used by Red Haven.
Thanks for the walkthrough!